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65 chevy c10 oil in the breather

Discussion in 'The Hokey Ass Message Board' started by theylive, Dec 29, 2013.

  1. theylive
    Joined: Feb 2, 2012
    Posts: 84

    theylive
    Member

    Hey guys, I'm getting oil in my air cleaner/breather and I'm not sure if I have the right air cleaner set up. If you notice in the photo, there is a hose coming from the front of the valve cover to the breather And that's where the oil coming in from, I have a new PVC valve btw... Im kinda lost with this and any suggestions would be appreciated. Thanks
     

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    Last edited: Dec 29, 2013
  2. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    Rings are worn, causing blowby that carries oil out the breather. A little is normal with an older engine. Either live with it or rering.
     
  3. Model T1
    Joined: May 11, 2012
    Posts: 3,309

    Model T1
    Member

    Son was having this problem with his later SBC. Ran some SeaFoam and drove it hard. Seems to be okay now. Maybe the rings are stuck.
     
  4. theylive
    Joined: Feb 2, 2012
    Posts: 84

    theylive
    Member

    Did you run sea foam directly in the crank case and how much did you use?
    The engine was supposedly rebuilt a few years ago but hardly driven... I got the truck from my great uncle who has dementia so it's next to impossible to get answers on what has been done to the truck.
     

  5. Rick Sis
    Joined: Nov 2, 2007
    Posts: 710

    Rick Sis
    Member
    from Tulsa OK

    It appears that you have a breather in the oil fill hole. With the system that pulls air from the air filter housing, as we have here, there should be a sealed cap in the oil fill hole.

    I'm thinking that the open breather in the oil fill hole is preventing the necessary vacuum at the hose to keep it clean, and you are getting back flow there.
     
  6. theylive
    Joined: Feb 2, 2012
    Posts: 84

    theylive
    Member

    I had a sealed oil cap and it did the same thing... Oil blow back, I replaced it with a breather type cap and no change. Thanks for the post... Keep me' coming, last thing I want to do is a rebuild.
     
  7. theylive
    Joined: Feb 2, 2012
    Posts: 84

    theylive
    Member

    Does anyone know if it would be a problem to just block off that little hose coming off the valve cover going it to the air cleaner being that I have a breather cap?
     
  8. JohnEvans
    Joined: Apr 13, 2008
    Posts: 4,883

    JohnEvans
    Member
    from Phoenix AZ

    There should be a baffle inside the valve cover where the hose hooks up,if not there that may be the problem. Won't hurt anything to block off the hose being you have the breather style cap. With the engine running pull the PCV out of the valve cover and see if you have vacuum on the engine side,if not the fitting at the manifold end may be plugged up.
     
  9. theylive
    Joined: Feb 2, 2012
    Posts: 84

    theylive
    Member

    Thanks for the response. I'll give that a try next year in the morning.
     

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